P0712

DTC P0712: Transmission Fluid Temperature Sensor System (Short Circuit)

















DESCRIPTIONS OF MONITOR METHODS

- When the status of transmission fluid temperature 180°C (356°F) or more is detected for 10 minutes continuously with the conditions as follows; Vehicle speed: 10 km/h (6.2 mph) or more, transmission range switch position: D, accelerator pedal position: 12.5% or more, engine speed: more than 500 r/min

MONITOR EXECUTION

- transmission range:D

- Vehicle speed: more than 10 km/h (6.2 mph)

- Throttle valve opening: more than 1/8

- Engine speed: more than 305 r/min

MONITOR EXECUTION CONDITIONS (OTHER MONITOR AND SENSOR)

Other Monitor (There is no temporary DTC stored in memory for the item monitored below)

- Not applicable
Sensor (The sensor below is determined to be normal)

- Not applicable

LOGIC FLOW CHARTS (Monitor Sequence)





DTC SET CONDITIONS

Check Conditions

- Vehicle speed: 10 km/h (6.2 mph) or more.

- Transmission range switch position: D.

- Throttle opening: 12.5 % or more.

- Engine speed: more than 500 r/min.
Judgment Criteria

- Value of temperature of transmission fluid: 180°C (356°F) or more. (10 minutes)

OBD-II DRIVE CYCLE PATTERN

With the vehicle speed 10 km/h (6.2 mph) or more and the throttle valve opening 12.5% or more, drive for 10 minutes or more.

TROUBLESHOOTING HINTS (THE MOST LIKELY CAUSES FOR THIS CODE TO BE SET ARE:)

- Malfunction of the transmission fluid temperature sensor system (Short circuit) circuit

- Malfunction of the transmission fluid temperature sensor

- Malfunction of the TCM

DIAGNOSIS

STEP 1. Check the TCM terminal voltage.

[C-38 TCM connector (vehicle side, connected)]

Turn ON the ignition switch, and check the voltage between terminal No. 39 and No. 50.

- Transmission fluid 20°C (68°F): Approx. 2.52 V

- Transmission fluid 80°C (176°F): Approx. 0.69 V

Q. Is the check result normal?

YES Go to Step 6.
NO Go to Step 2.
STEP 2. Check the transmission fluid temperature sensor.

Refer to Testing and Inspection.

Q. Is the check result normal?

YES Go to Step 3.
NO Replace the valve body assembly.
STEP 3. Check the wiring harness between the transmission fluid temperature sensor and TCM.

Check that the wiring harness between the A/T control solenoid valve assembly connector and TCM is not shorted to the body and other wiring harness.

Q. Is the check result normal?

YES Go to Step 4.
NO Repair or replace the failure section.
STEP 4. Check the TCM power supply and ground.

Q. Is the check result normal?

YES Go to Step 5.
NO Repair or replace the failure section.
STEP 5. Check the TCM connector pin terminal and the connection status.

Q. Is there a failure point?

YES Repair or replace the failure section.
NO Replace the TCM.
STEP 6. Erase the DTC code, and drive the vehicle for a while.

Check that the normal code is displayed.

Q. Is the check result normal?

YES The procedure is complete.
NO Replace the TCM.